<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        body {
            position: relative;
        }

        div:first-of-type {
            float: left;
            width: 400px;
            height: 200px;
            background-color: aqua;
        }

        div:last-of-type {
            float: left;
            width: 200px;
            height: 200px;
            background-color: antiquewhite;
        }

        div:first-of-type::after {
            content: "";
            display: block;
            width: 20px;
            height: 20px;
            border-radius: 10px;
            background-color: #ffffff;
            position: absolute;
            top: 190px;
            left: 390px;
        }

        div:first-of-type::before {
            content: "";
            display: block;
            width: 20px;
            height: 20px;
            border-radius: 10px;
            background-color: #ffffff;
            position: absolute;
            top: -10px;
            left: 390px;
        }
    </style>
</head>

<body>


    <div>

    </div>
    <div>

    </div>
</body>

</html>